The interesting thing to me is Bush Jr. Why did he start off low and then do better and better until he dropped again in 2004. Why was 2003 so high?

He was very unimpressive at the beginning of his term, so that makes sense that early 2001 was low. But then we had 9/11 and his subsequent war on terror, so I understand the bump up in 2002. But why so high in 2003? And then the massive drop off in 2004?